MESON Chess Problem Database

Problem Display
PID: 139134 (8/4p1nB/Kp2prn1/pQ1N4/r3k3/8/1BbP2Pb/3N1R2 w - - 0 1)

Zappas, Byron

2nd Comm., BCF 123. Ty., 1969-1970

8/4p1nB/Kp2prn1/pQ1N4/r3k3/8/1BbP2Pb/3N1R2

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qc4#
    • 1...Ra2
      • 2.Qc4#
    • 1...Ra3
      • 2.Qc4#
    • 1...Rc4
      • 2.Qxc4#
    • 1...Rd4
      • 2.S5c3#
    • 1...Rf5
      • 2.Re1#
    • 1...Bxd1
      • 2.d3#
    • 1...Bb3
      • 2.d3#
    • 1...Sf5
      • 2.Sf2#
    • 1...exd5
      • 2.Qe2#
  • Tries
    • 1.Bxg6+?
      • 1...Rf5
        • 2.Sf2#
        • 2.Re1#
      • 1...Sf5
        • 2.Sf2#
        • 2.Re1#
      • 1...Rxg6!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Qe5#
      • 1...Rxf4
        • 2.Re1#
      • 1...Bxf4
        • 2.Sf2#
      • 1...e5
        • 2.Qxe5#
      • 1...Rd4
        • 2.Sc3#
      • 1...Rf5
        • 2.Qe2#
      • 1...Bd3
        • 2.Qxd3#
      • 1...Sf5
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • R(c);N_GUARD::QAR2(F)
    • R(c);N_GUARD::QAR2(F),XR(c)
    • R(c);SBLOCK::S(G)
    • R(h);N_SPINS(i),SBLOCK::R(B)
    • B(a);N_GUARD,XS(A)::P(D)
    • B(a);N_GUARD::P(D)
    • S(k);N_SPINS(i),SBLOCK,S_CUTR(h)::S(A)
    • P(g);SBLOCK,XS(G)::QAR2(F)
  • Tries
    • Try
      • B(I);CHECK,XS(i)
      • Refutation
        • R(h);XB(I)
  • Actual
    • S(G);
    • Threat
      • QAR1(F)
    • Vars
      • R(h);SBLOCK,XS(G)::R(B)
      • B(b);SBLOCK,XS(G)::S(A)
      • P(g);::QAR1(F),XP(g)
      • R(c);SBLOCK::S(A)
      • R(h);N_SPINS(i),SBLOCK::QAR2(F)
      • B(a);N_GUARD,P_PINQ(F)::QAB1(F),XB(a)
      • S(k);N_SPINS(i),SBLOCK::QAB(F)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).